html {
    scroll-behavior: smooth;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 1050;
    padding: 0.5rem 1rem;
    background: var(--mrtk-cyan, #00cbf4);
    color: #fff;
}
.skip-link:focus {
    left: 0;
}

/* Charte colorimétrique basée sur le logo MRTK */
:root {
    --mrtk-dark: #0A1120; /* Bleu marine très sombre */
    --mrtk-cyan: #00Cbf4; /* Bleu cyan des slashs */
    --mrtk-light: #F8F9FA; /* Gris très clair pour les fonds */

    /* Jetons de thème (mode clair par défaut) */
    --bg-page: #ffffff;
    --bg-surface: var(--mrtk-light);
    --bg-card: #ffffff;
    --ink: var(--mrtk-dark);
    --ink-muted: #6c757d;
    --border-soft: rgba(0, 0, 0, 0.1);
}

html[data-theme="dark"] {
    --bg-page: #0A1120;
    --bg-surface: #111B2E;
    --bg-card: #16213A;
    --ink: #F1F5F9;
    --ink-muted: #9AA8BD;
    --border-soft: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, sans-serif;
    background-color: var(--bg-page);
    color: var(--ink);
}

/* Transition harmonisée pour le changement de thème clair / sombre */
body,
.bg-light,
.card,
.accordion-item,
.accordion-button,
.list-group-item,
.border-top,
.text-muted,
.text-secondary,
.text-mrtk-dark,
.price-unit,
.ref-tag {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.accordion-button::after {
    transition: filter 0.3s ease;
}

.text-mrtk-dark {
    color: var(--ink) !important;
}

.bg-light {
    background-color: var(--bg-surface) !important;
}

.card {
    background-color: var(--bg-card);
    color: var(--ink);
}

.text-muted,
.text-secondary {
    color: var(--ink-muted) !important;
}

.border-top {
    border-top-color: var(--border-soft) !important;
}

html[data-theme="dark"] .service-card {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-soft);
}

#themeToggle {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    flex-shrink: 0;
}

/* Couleurs personnalisées */
.bg-mrtk-dark {
    background-color: var(--mrtk-dark) !important;
}

.bg-mrtk-cyan {
    background-color: var(--mrtk-cyan) !important;
}

.text-mrtk-cyan {
    color: var(--mrtk-cyan) !important;
}

/* Boutons personnalisés */
.btn-mrtk-cyan {
    background-color: var(--mrtk-cyan);
    color: #fff;
    border: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-mrtk-cyan:hover {
    background-color: #00a8cc;
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline-mrtk {
    border: 2px solid var(--mrtk-cyan);
    color: var(--mrtk-cyan);
    font-weight: 600;
}

.btn-outline-mrtk:hover {
    background-color: var(--mrtk-cyan);
    color: #fff;
}

/* Navbar */
.navbar-brand {
    font-weight: 900;
    font-size: 1.8rem;
    letter-spacing: 1px;
}

/* Sections */
.section-padding {
    padding: 80px 0;
}

/* Cartes de service */
.service-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}
.service-card:hover {
    transform: translateY(-10px);
    border-bottom: 4px solid var(--mrtk-cyan);
}
.service-icon {
    font-size: 2.5rem;
    color: var(--mrtk-cyan);
    margin-bottom: 1rem;
}

/* Page Tarifs : accordéon et listes de prestations */
.accordion-item {
    background-color: var(--bg-card);
    border-color: var(--border-soft);
}

.accordion-button {
    background-color: var(--bg-card);
    color: var(--ink);
    font-weight: 700;
}

.accordion-button:not(.collapsed) {
    background-color: var(--bg-surface);
    color: var(--mrtk-cyan);
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 203, 244, 0.25);
}

html[data-theme="dark"] .accordion-button::after {
    filter: invert(1) brightness(1.8);
}

.list-group-item {
    background-color: var(--bg-card);
    color: var(--ink);
    border-color: var(--border-soft);
}

.price-tag {
    color: var(--mrtk-cyan);
    font-weight: 700;
    white-space: nowrap;
}

.price-unit {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--ink-muted);
}

.ref-tag {
    font-size: 0.75rem;
    color: var(--ink-muted);
}